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GRAPHICS CARD · WORKLOAD FIT

NVIDIA
RTX 4090

Ada flagship with 24 GB GDDR6X, 384-bit bus and 450 W reference power; NVIDIA recommends an 850 W system PSU.

Reference: Exact GPU — partner card requiredPlatform: GeForcePrimary check: Exact partner model
NVIDIA RTX 4090
MODEL PHOTOExact model shown
Best forProjects that exceed a 16 GB card’s memory but fit in 24 GB.
Also strongKeeping an existing Ada workstation running without changing its software stack.
Main limitA workload needing more than 24 GB still requires offloading, splitting or a different card.
Check firstOn a used card, inspect the power connector and establish the remaining warranty before comparing prices.
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✓ Merchant links reviewed September 4, 2026

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Before buying the RTX 4090

Compare performance, memory and cost before choosing.

RTX 4090 dimensions, weight and display outputs

These specifications describe the Founders Edition. ASUS, MSI and Gigabyte RTX 4090 cards can have different dimensions: match the card’s part number, not just its GPU name.

Memory24 GB GDDR6X · 384-bit
Founders Edition dimensions304 × 137 × 61 mm · 3 slots
Reference outputs3 × DisplayPort 1.4a · 1 × HDMI 2.1a
Reference graphics power450 W
NVIDIA reference system PSU850 W

NVIDIA · reference specifications checked September 19, 2026 ↗

How much does an RTX 4090 weigh?

There is no single weight for this family. The NVIDIA specification linked above does not publish a mass, so no estimate is presented as a specification. For a used card or shipping quote, request the exact model and distinguish card weight from packaged weight.

Are the dimensions enough to check case fit?

Also check front fans or radiators, neighbouring expansion cards and the power cable. A card can fit lengthwise while leaving too little clearance to close the side panel. Check the cable instructions and exact partner-card manual before buying.

A used RTX 4090: three checks before comparing price

  1. A photo of the exact model label, with personal identifiers covered. The RTX 4090 name does not establish cooler dimensions or box contents.
  2. A recent video of the card running, with the software and workload identifiable. An idle screenshot does not document behaviour under load.
  3. The seller’s written return terms, included accessories and any applicable warranty. A receipt alone does not establish transferable coverage.

These checks reduce unknowns; they do not certify the card’s internal condition. Then compare the complete cost with a new option meeting the same need.

Other useful details

For a gaming upgrade, compare the extra frames in your games. For local AI, first check whether the whole workload fits: buying an older flagship does not solve every memory limit.

A question about this product?

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